I can not figure out what's wrong with my code

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Saurav Goyal
Saurav Goyal 2016-2-7
编辑： Jan 2016-2-9
t = -2:0.01:4;
x = zeros(size(t));
x(find(t=-1 & t=1)) = 0.5*t+0.5;
x(find(t=1 & t=3)) = -0.5*t+1.5;
y = dirac(2);
z = conv(x,y);
plot(t,z);
I get this error message for line 3: "In an assignment A(I) = B, the number of elements in B and I must be the same."
  1 个评论
Jan
Jan 2016-2-7
Please post the code with one command per line. On one hand this is easier to read. On the other hand it gets clear, which command caused the error.

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回答（2 个）

Jan
Jan 2016-2-7
编辑：Jan 2016-2-9
The line
x(find(t=-1 & t=1)) = 0.5*t+0.5;
fails, when the number of elements on the right and the left side differ. But in addition "t=-1" is an assignment, not a comparison. And finally it is impossible that t equals -1 and +1 at the same time. Perhaps you mean:
x(t==-1 | t==1) = 0.5 * t(t==-1 | t==1) + 0.5;
Note that an exact comparison is not meaningful with floating point numbers with a limited precision. See http://www.mathworks.com/matlabcentral/answers/57444-faq-why-is-0-3-0-2-0-1-not-equal-to-zero
Image Analyst
Image Analyst 2016-2-7
This (t=-1 & t=1) is also not correct. You should use == and don't need find() at all. Perhaps you mean this:
t = -2:0.01:4;
x = zeros(size(t));
indexes = (t==-1 & t==1)
x(indexes) = 0.5*t(indexes) + 0.5;
indexes = (t==-1 & t==1)
x(indexes) = -0.5*t(indexes) + 1.5;
y = dirac(2);
z = conv(x,y);
plot(t,z);
But I don't have the dirac() function and don't really know what you want to do.

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